Power mechanism



5 Sheets-Sheet 1 J. G. GIBSON POWER MECHANISM Filed April 29, 1953 Nov. 5, 1935.

IN VEN TOR.

A TTORNEYS.

4 w 4 Na HAMZIQV W.v

I'I IIIIl-l Ran NUV. 5, 1935. J, G GIBSON 2,019,670

POWER MECHANISM 7 Filed April 29, 1953 3 Sheets-Sheet 2 IN VEN TOR.

BY 2M K v ATTORNEYS.

Nov, 5, 1935. J. G. GiBSON ,0

POWER MECHANISM Filed April 29, 1955 3 Sheets-Sheet 5 I A TTORNEYS.

/@ IN VEN TOR.

Patented Nov. 5, 1935 UNITED STATES.

PATENT OFFICE POWER MECHANISM Application April 29, 1933, Serial No. 668,585

3 Claims.

Power mechanisms, such as are used in connection with pumping groups of wells, are subjected to very severe strains and duty. It is very difficult to maintain them in good running 5 order in the field and in consequence more or less frequent renewals and expensive repairs are necessary. In these powers there is arranged a pull ring, or head, to which the pull rods leading to the wells of the group being pumped from the power are secured and this ring rotates relatively to the eccentric, or crank, which gives orbital movement to the ring and consequently reciprocating movement to the rods. The very heavy strains and the uneven nature of the pull of the rods makes it very difficult to maintain a smooth-working joint between the pull ring and the eccentric, or crank. The present invention is designed to obviate this difficulty. Broad- 1y speaking it is accomplished by introducing a bushing of bearing metal into this joint and preferably forming this bushing so that it may be removed without disengaging the pull rods. It Will be understood that these pull rods are under considerable strain, and if the structure is such as it has been ordinarily in the past as to necessitate the breaking of the connection between the rods and the ring the repair of this joint, or renewal of the eccentric, or crank, is quite an extended and expensive operation. With this invention this can be conveniently performed and while the construction is such as to reduce the frequency of such renewals, or repairs, such repairs can be made quickly and readily at a minimum of expense. Features and details of the invention will appear from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as follows:

Fig. 1 shows a side elevation, partly in section, of the structure.

Fig. 2 is an enlarged section on the line 2-2 in Fig. 3.

Fig. 3 is a plan view of one of the eccentrics with the ring in place.

Fig. 4 is an enlarged section on the line 4-4 in Fig. 3.

Fig. 5 is a plan view of the eccentric with the pull ring loosened to permit the removal of the wear bushing.

Fig. 6 is a perspective view of one of the bearing segments.

Fig. '7 is an enlarged section of the upper ring and its joint showing a modification.

l marks the concrete base on which the power is mounted, 2 the base of the power, 3 a frame secured on the base 2, 4'8. reduction gear mounted on the frame, and 5 a drive pulley driving a coupling 6 through the reduction gear, this reduction gear being a standard product and may be of any desired construction. The coupling 6 is 5 secured to a fitting I by bolts 3 and the fitting 1 is secured to a pad Ill on one of the eccentrics II. The eccentric H has a pad l2 registering with the pad ll) engaging and secured with a pad its on the lower eccentric [4. A pad i5 registering with the pad I3 is arranged on the bottom of the eccentric l4 and engages and is secured to a fitting H. The: fitting I7 is journaled through a roller bearing I8 arranged in asocket E9 in the base. These fittings and eccentrics are all tied together by bolts Illa. which extend through the eccentrics and fittings and lock the same in a rigid structure which is locked through the upper coupling with the drive through the reduction gear. A pull ring 23 is arranged around each eccentric. This ring has at intervals notches 2| in which are seated pins 22, the pins extending through spools 23 on which eyes 25 of pull rods 25 are formed. The pins 22 are secured by U-bolts 26, the U-bolts extending through ears 25 21 on the faces of the ring and being secured by nuts 28. The spools 23 can rock on the pins and thus they form a bearing which permits the rocking of the rods suiiiciently to accommodate the orbital movement of the ring as the eccentric rotates. The ring is split and the halves of the ring are secured together by bolts 38, these bolts being of suflicient length to permit of some separation of the halves of the ring without breaking the connection between them.

The periphery of the eccentric has a spherical surface 3! with a center at the center of the eccentric. A bushing 32 has a similar spherical surface 33 seated on the surface 3!. The outer surface of the bushing may be spherical, as shown at 34, and this engages a surface 35 on the ring. The ring may be secured with shoulders 36 with relation to the bushing. The spherical connection, however, may be used for maintaining the parts in position. At least one of the surfaces should be spherical so as to accommodate any uneven strain occasioned by a misalinement of the rods.

Preferably the bearing bushing is formed in segments and these segments are floating in the space between the ring and the eccentric. The thickness of the shoulders 36, or engaging means as the engaging surfaces 3| and 33 for holding the assembly of the bushing and ring is such that the segments may be readily removed when the connecting bolts 30 are loosened sufficiently to allow some separation of the parts of the pull ring (see Fig. 5). With the bushings in segments these segments may be worked around to the same side of the ring to facilitate their removal. The eccentric may, however, be manipulated to bring the major opening into position for the easy removal of the segments. Any, or all of the segments may be removed and new segments substituted. 'I'hus'it is possible, with.- out materially relieving the strain on the rods, to make a complete replacement and repair of the bearing portion of the joint between the ring and the eccentric. It also provides for both the eccentric and the ring a bearing metal with ample surface to assure an eificient bearing.

Any convenient lubrication may be supplied. As shown, cups 39 are provided carrying lubricating material and these are connected by small tubes 40 which extend to points over the bushing. Preferably the bushing is slightly beveled at 38 adjacent its ends to permit of the entrance of the lubricant to the bearing.

In the modification shown in Fig. 7, the eccentric is provided with a peripheral groove 4| and the bushing 42 has an annular rib 43 which enters the groove 4|. The outer surface of the bushing at 44 is spherical and the ring has a corresponding spherical surface 45. Shoulders 46 may be provided, but they should provide sufiicient clearance to permit of the movement of the joint on the spherical surface. The shoulders in this case are used merely as a precaution to maintain the assembly.

What I claim as new is:-

1. In a power mechanism, the combination of an eccentric; a split pull ring around the eccentric and spaced therefrom; a removable wear bushing between the ring and eccentric; and means connecting the parts of the split ring maintaining the ring in normal operating position, said means permitting a separation of the parts of the split ring while maintaining a connection between them providing clearance for the disengagement of the movable wear bushing.

2. In a power mechanism, the combination of an eccentric; a split ring around the eccentric; a removable bushing in the form of segments between the ring and the eccentric, said bushing and ring having means locking the segments against axial disengagement with the split ring in closed position; and means connecting the parts of the split ring, said means permitting a separation of said parts while maintaining a connection between the parts providing clearance for the disengagement of the segments of the removable wear bushing.

3. In a power mechanism, the combination of an eccentric; a split ring around the eccentric; a removable bushing in the form of segments between the ring and the eccentric, said segments having oil recesses formed at the ends of the segments, said bushing and ring having means locking the segments against axial disengagement with the split ring in closed position; and means connecting the parts of the split ring, said means permitting a separation of said parts while maintaining a connection between the parts providing clearance for the disengagement of the segments of the removable bushing.

JESSE G. GIBSON. 

